Micromotion Sensor Instl

Installation Manual20002158, Rev DD

April 2012

Micro Motion ELITE Coriolis Flow and DensitySensors

Safety and approval information

This Micro Motion product complies with all applicable European directives when properly installed in accordance with theinstructions in this manual. Refer to the EC declaration of conformity for directives that apply to this product. The EC declaration ofconformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available onthe internet at www.micromotion.com/atex or through your local Micro Motion support center.

Information affixed to equipment that complies with the Pressure Equipment Directive can be found on the internet atwww.micromotion.com/documentation.

For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.

Other information

Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the transmitterconfiguration manual. Product data sheets and manuals are available from the Micro Motion web site at www.micromotion.com/documentation.

Return policy

Micro Motion procedures must be followed when returning equipment. These procedures ensure legal compliance withgovernment transportation agencies and help provide a safe working environment for Micro Motion employees. Failure to followMicro Motion procedures will result in your equipment being refused delivery.

Information on return procedures and forms is available on our web support system at www.micromotion.com, or by phoning theMicro Motion Customer Service department.

Micro Motion customer service

Email

• Worldwide: [email protected]

• Asia-Pacific: [email protected]

North and South America Europe and Middle East Asia Pacific

United States 800-522-6277 U.K. 0870 240 1978 Australia 800 158 727

Canada +1 303-527-5200 The Netherlands +31 (0) 318 495 555 New Zealand 099 128 804

Mexico +41 (0) 41 7686 111 France 0800 917 901 India 800 440 1468

Argentina +54 11 4837 7000 Germany 0800 182 5347 Pakistan 888 550 2682

Brazil +55 15 3238 3677 Italy 8008 77334 China +86 21 2892 9000

Venezuela +58 26 1731 3446 Central & Eastern +41 (0) 41 7686 111 Japan +81 3 5769 6803

Russia/CIS +7 495 981 9811 Korea +82 2 3438 4600

Egypt 0800 000 0015 Singapore +65 6 777 8211

Oman 800 70101 Thailand 001 800 441 6426

Qatar 431 0044 Malaysia 800 814 008

Kuwait 663 299 01

South Africa 800 991 390

Saudia Arabia 800 844 9564

UAE 800 0444 0684

Contents

Chapter 1 Planning ...........................................................................................................................11.1 Installation checklist ........................................................................................................................11.2 Best practices ..................................................................................................................................21.3 Environmental limits .......................................................................................................................31.4 Recommendations for hygienic and self-draining applications ........................................................5

Chapter 2 Mounting .........................................................................................................................72.1 Mount the sensor ............................................................................................................................72.2 Mount electronics of high-temperature sensors ..............................................................................82.3 Mount a CMF010 sensor to a wall or pole ......................................................................................112.4 Mount a CMFS010 or CMFS015 sensor in a bracket .......................................................................122.5 Secure wafer-style process connections ........................................................................................132.6 Attach extended electronics .........................................................................................................15

Chapter 3 Wiring ............................................................................................................................173.1 Options for wiring .........................................................................................................................173.2 Connect 4-wire cable ....................................................................................................................183.3 Connect 9-wire cable ....................................................................................................................22

Chapter 4 Grounding ......................................................................................................................24

Chapter 5 Supplementary information ............................................................................................255.1 Purge the sensor case ....................................................................................................................255.2 About rupture disks .......................................................................................................................275.3 Pressure ratings for EN-1092 flanges .............................................................................................27

Contents

Installation Manual i

Contents

ii Micro Motion ELITE

1 PlanningTopics covered in this chapter:

• Installation checklist

• Best practices

• Environmental limits

• Recommendations for hygienic and self-draining applications

1.1 Installation checklist□ Make sure that the hazardous area specified on the approval tag is suitable for the

environment in which the meter will be installed.

□ Verify that the local ambient and process temperatures are within the limits of themeter. See Section 1.3.

□ If your sensor has an integral transmitter, no wiring is required between the sensorand transmitter. Follow the wiring instructions in the transmitter installation manualfor signal and power wiring.

□ If your transmitter has remote-mounted electronics, follow the instructions in thismanual for wiring between the sensor and the transmitter, and then follow theinstructions in the transmitter installation manual for power and signal wiring.

□ For the wiring between the sensor and the transmitter, consider maximum cablelengths. The maximum distance between the sensor and transmitter depends onthe cable type. For all types of wiring, Micro Motion recommends using MicroMotion cable.

Maximum lengths for Micro Motion cableTable 1-1:

Cable type To transmitter Maximum length

Micro Motion 9-wire 9739 MVD transmitter 1000 ft (300 m)

All other MVD transmitters 60 ft (20 m)

Micro Motion 4-wire All 4-wire MVD transmitters 1000 ft (300 m)

Maximum lengths for user-supplied 4-wire cableTable 1-2:

Wire function Wire size Maximum length

Power (VDC) 22 AWG (0,35 mm2) 300 ft (90 m)

20 AWG (0,5 mm2) 500 ft (150 m)

18 AWG (0,8 mm2) 1000 ft (300 m)

Signal (RS-485) 22 AWG (0,35 mm2) or larger 1000 ft (300 m)

Planning

Installation Manual 1

□ For optimal performance, install the sensor in the preferred orientation. The sensorwill work in any orientation as long as the flow tubes remain full of process fluid.

Preferred sensor orientationTable 1-3:

ProcessPreferred orienta-

tionAlternate orientations

Liquids

Gases

Slurries

□ Install the meter so that the flow direction arrow on the sensor case matches theactual forward flow of the process. (Flow direction is also software-selectable.)

1.2 Best practicesThe following information can help you get the most from your sensor.

Planning

2 Micro Motion ELITE

• There are no pipe run requirements for Micro Motion sensors. Straight runs of pipeupstream or downstream are unnecessary.

• If the sensor is installed in a vertical pipeline, liquids and slurries should flow upwardthrough the sensor. Gases may flow upward or downward.

• Keep the sensor tubes full of process fluid.

• For halting flow through the sensor with a single valve, install the valve downstreamfrom the sensor.

• Minimize bending and torsional stress on the meter. Do not use the meter to alignmisaligned piping.

• The sensor does not require external supports. The flanges will support the sensor inany orientation. (Some sensor models installed in very small, flexible pipeline haveoptional installation instructions that allow for external supports.)

• When transporting or lifting large sensors, it may be useful to identify the sensor'scenter of gravity. Refer to the Product Data Sheet for exact center-of-gravity andweight specifications.

Center of gravity for large metersFigure 1-1:

A

A. Approximate center of gravity

1.3 Environmental limitsThe ambient and process temperature limits of the sensor are shown in the followingfigures.

• For all ELITE sensor models except high-temperature and extreme-high-temperature models, see Figure 1-2.

• For high-temperature and extreme-high-temperature ELITE sensors, see Figure 1-3.

Planning


Environmental limits for typical sensorsFigure 1-2:

Maximum process temperature in °F (°C)

176 (80)

140 (60)

104 (40)

68 (20)

32 (0)

–4 (–20)

–40 (–40)

–76 (60)

–112 (–80)

–148 (–100)

–184(–120)

–292(–180)

–400(–240)

–76(–60)

32(0)

140(60)

248(120)

356(180)

464(240)400

(204)

140(60)

113 (45)

Am

bien

t tem

pera

ture

of c

ore

proc

esso

r or

tran

smit

ter i

n °F

(°C

)

Gray area = Mount transmitter remotely (use junction box)

Notes• When ambient temperature is below –40 °F (–40 °C), a core processor or transmitter must be

heated to bring its local ambient temperature to between –40 °F (–40 °C) and +140 °F (+60 °C).Long-term storage of electronics at ambient temperatures below –40 °F (–40 °C) is notrecommended.

• Temperature limits may be further restricted by hazardous area approvals. Refer to the hazardousarea approvals documentation shipped with the sensor or available from the Micro Motion web site(www.micromotion.com).

• The extended-electronics option allows the sensor case to be insulated without covering thetransmitter, core processor, or junction box, but does not affect temperature ratings.

• For the purposes of selecting electronics options, this graph should be used only as a general guide.If your process conditions are close to the gray areas, it may be inappropriate to use electronicsoptions other than a junction box. Consult with your Micro Motion representative.

Planning


Environmental limits for high-temperature sensorsFigure 1-3:

Maximum process temperature in °F (°C)

176 (80)

140 (60)

104 (40)

68 (20)

32 (0)

–4 (–20)

–40 (–40)

–76 (60)

–112 (–80)

–148 (–100)

122(50)

32(0)

–58(–50)

212(100)

302(150)

392(200)

482(250)

572(300)

752(400) 800

(427)

Am

bien

t tem

pera

ture

of c

ore

proc

esso

r or

tran

smit

ter i

n °F

(°C

)

Gray area = Mount transmitter remotely (use junction box)

662(350)

842(450)

Extreme high-temp. models

High-temp. models

Notes• When ambient temperature is below –40 °F (–40 °C), a core processor or Model 2400S transmitter

must be heated to bring its local ambient temperature to between –40 °F (–40 °C) and +140 °F(+60 °C). Long-term storage of electronics at ambient temperatures below –40 °F (–40 °C) is notrecommended.

• Temperature limits may be further restricted by hazardous area approvals. Refer to the hazardousarea approvals documentation shipped with the sensor or available from the Micro Motion web site(www.micromotion.com).

1.4 Recommendations for hygienic and self-draining applicationsCMFS sensors are certified EHEDG TYPE EL CLASS I for hygienic applications when installedvertically with the process fitting and gasket combinations listed in the Position Paper ofthe EHEDG Test Methods Subgroup (available at www.ehedg.org). Other processconnections/gasket combinations may be used provided they have been evaluated andsuccessfully tested for in-place cleanability according to the latest edition of EHEDGDocument 2. Refer to the ELITE Product Data Sheet for further information about fittingoptions.

For optimal cleanability and drainability:

Planning


• If possible, install the sensor in a vertical pipeline with the process fluid flowingupward through the sensor.See Figure 1-4.

• If the sensor must be installed in a horizontal pipeline, drainage is accomplished byair purge evacuation of the pipeline circuit.

• For clean-in-place (CIP) applications, Micro Motion recommends using thegenerally-accepted flow velocity of at least 1.5 m/s for cleaning the sensor.

• The gap between the electronics housing and sensor body should be inspectedperiodically. Manually clean this gap when necessary.

Installation for self-draining applicationsFigure 1-4:

A

B

C

A. Process pipelineB. Direction of normal process flowC. Direction of drainage

Planning


2 MountingTopics covered in this chapter:

• Mount the sensor

• Mount electronics of high-temperature sensors

• Mount a CMF010 sensor to a wall or pole

• Mount a CMFS010 or CMFS015 sensor in a bracket

• Secure wafer-style process connections

• Attach extended electronics

2.1 Mount the sensorUse your common practices to minimize torque and bending load on process connections.

TipTo reduce the risk of condensation or excessive moisture, the conduit opening should not pointupward (if possible). The conduit opening of the junction box or core processor can be rotated freelyto facilitate wiring.

CAUTION!

Do not lift the sensor by the electronics or purge connections. Lifting the sensor by theelectronics or purge connections can damage the device.

Mounting


Mounting the sensorFigure 2-1:

Notes• Do not use the sensor to support the piping.• The sensor does not require external supports. The flanges will support the sensor in any

orientation. (Some sensor models installed in very small, flexible pipeline have optional installationinstructions that allow for external supports.)

2.2 Mount electronics of high-temperature sensorsThe electronics of high-temperature sensors are attached to the end of a 32" (812 mm)pre-installed flexible conduit. The electronics must be separately mounted on a wall orinstrument pole.

See Figure 2-2 for an illustration of high-temperature sensor electronics.

Mounting


Components of a high-temperature sensorFigure 2-2:

AB

C

D

A. ElectronicsB. Mounting bracketC. Flexible conduit (minimum bend radius 6" [152 mm])D. Sensor

With some large meter sizes, the meter may ship with the electronics attached to thesensor case. See Figure 2-3. The meter cannot be operated in this configuration. Detachthe electronics bracket from the sensor case and then proceed to mount the electronics toa wall or instrument pole as described below.

ImportantDo not operate the meter while the electronics are attached to the sensor case.

Mounting


Removing electronics from the sensor caseFigure 2-3:

A

A. Detach electronics from sensor case and mount to a wall or instrument pole

Procedure

• For wall mounting, use four 5/16" or four M8 bolts to secure the mounting bracket.See Figure 2-4.

Wall-mount componentsFigure 2-4:

AB

C

A. Wall or flat surfaceB. Electronics (enhanced core processor shown)C. Flexible conduit

• For mounting to an instrument pole, use a 2-inch U-bolt pipe kit to secure themounting bracket. See Figure 2-5.

Mounting


Pole-mount componentsFigure 2-5:

A

B

C

A. Instrument poleB. Electronics (enhanced core processor shown)C. Flexible conduit

2.3 Mount a CMF010 sensor to a wall or poleThe CMF010 sensor has an optional mounting configuration for use with small or flexiblepipeline. If the pipeline adequately supports the sensor, this procedure can be skipped.

1. Locate the optional mounting holes. For sensors with a junction box, the junctionbox must be rotated to the side to expose the mounting holes. See Figure 2-6.

Mounting


Optional mounting for CMF010 sensorsFigure 2-6: A

B

C

A. Two user-supplied 5/16" (M8) boltsB. Junction box or core processor (junction box shown)C. Mounting surface

2. If necessary, install rigid standoffs between the sensor and the mounting surface.

3. Using two user-supplied 5/16" (M8) bolts (minimum length 2 1/4" [58 mm]), securethe sensor case to the mounting surface.

2.4 Mount a CMFS010 or CMFS015 sensor in abracketThe CMFS010 and CMFS015 sensors have an optional mounting bracket for use with smallor flexible pipeline. If the pipeline adequately supports the sensor, this procedure can beskipped.

1. Secure the mounting bracket to a wall or other flat surface with four user-supplied5/16" (8 mm) bolts. See Figure 2-7.

2. Place the sensor into the bracket.

3. Secure the sensor in the bracket with the supplied 5/16" (M8) U-bolts.

Mounting


Mounting bracket for CMFS010 and CMFS015Figure 2-7:

A

B

C

A. Mounting bracketB. Mounting holesC. Supplied U-bolts

2.5 Secure wafer-style process connectionsA wafer-style connection lets you clamp the sensor into the pipeline. A wafer installationkit is shipped with a wafer-style sensor.

1. Make sure that the bolts provided are rated for your process connection.

2. Slip the sensor alignment rings over each end of the sensor wafer, then insert thesensor between the process connections in the pipeline. See Figure 2-8.

TipMicro Motion recommends installing gaskets (user-supplied).

Mounting


Wafer-style connection componentsFigure 2-8: A B

C

D

E

A. Sensor waferB. Flange boltC. Alignment ringD. Flange nutE. Gasket (user-supplied)

3. Insert the flange bolts through both process connections, and thread the flange nutsonto the bolts.

4. With your fingers, tighten the flange nuts.

5. Rotate the sensor alignment rings in the direction that pushes the bolts outward.See Figure 2-9.

TipRotate both sensor aligment rings until the assembly is centered and tight.

Alignment ring usageFigure 2-9:

A

B

C

A. Direction to rotate the alignment ringB. Direction the flange bolts are pushedC. Flange bolt

Mounting


6. With a wrench, tighten the nuts in an alternating order.

2.6 Attach extended electronicsIf you ordered a sensor with extended electronics, you will need to install the extenderonto the sensor case.

NoteExtended core processors are matched at the factory to specific sensors. Keep each core processortogether with the sensor with which it was shipped.

CAUTION!

Keep the extender and feedthrough clean and dry. Moisture or debris in the extender orfeedthrough can damage electronics and result in measurement error or flowmeter failure.

Procedure

1. Remove and recycle the plastic cap from the feedthrough on the sensor. See Figure 2-10.

Mounting


Feedthrough and extender componentsFigure 2-10:

A

B

C

DE

FG

H

A. Transmitter or core processorB. ExtenderC. Plastic plugD. Plastic capE. O-ringF. Clamping ringG. Clamping screwH. Feedthrough

2. Loosen the clamping screw and remove the clamping ring. Leave the O-ring in placeon the feedthrough.

3. Remove and recycle the plastic plug from the extender.

4. Fit the extender onto the feedthrough by carefully aligning the notches on thebottom of the extender with the notches on the feedthrough.

5. Close the clamping ring and tighten the clamping screw to 13–18 in-lbs.(1,5–2 N-m).

Mounting


3 WiringTopics covered in this chapter:

• Options for wiring

• Connect 4-wire cable

• Connect 9-wire cable

3.1 Options for wiringThe wiring procedure you follow depends on which electronics option you have.

Wiring procedures by electronics optionTable 3-1:

Electronics option Wiring procedure

Integral transmitter No wiring required between sensor and transmitter. See the transmitter instal-lation manual for wiring the power and signal cable to the transmitter.

MVD™Direct Connect™ No transmitter to wire. See the MVD Direct Connect manual for wiring thepower and signal cable between the sensor and the direct host.

Core processor Connect a 4-wire cable between the sensor and transmitter. Refer to the 4-wireconnection instructions in this manual.

Junction box Connect a 9-wire cable between the sensor and transmitter. Refer to the 9-wireconnection instructions in this manual, as well as the Micro Motion 9-Wire Flow-meter Cable Preparation and Installation Guide.

CAUTION!

Make sure the hazardous area specified on the sensor approval tag is suitable for theenvironment in which the sensor will be installed. Failure to comply with the requirements forintrinsic safety in a hazardous area could result in an explosion.

CAUTION!

Fully close and tighten all housing covers and conduit openings. Improperly sealed housingscan expose electronics to moisture, which can cause measurement error or flowmeter failure.Inspect and grease all gaskets and O-rings.

Wiring


3.2 Connect 4-wire cable

3.2.1 Prepare the 4-wire cable

ImportantFor user-supplied cable glands, the gland must be capable of terminating the drain wires.

NoteIf you are installing unshielded cable in continuous metallic conduit with 360º termination shielding,you only need to prepare the cable – you do not need to perform the shielding procedure.

Wiring


4-wire cable preparationFigure 3-1:

Cable layout

Run conduit to sensor

Metal conduit

Wrap the drain wires twice around the shield and cut off the excess drain wires.

Micro Motioncable gland

Pass the wires through the gland.

Terminate the drain wires inside the

gland.

Cable glands

Remove the core processor cover

Go to the shielding procedure

Done(do not perform the shielding procedure)

Gland supplierUser-supplied

cable gland

Lay cable in conduit

Drain wires wrapped around shield

Gland type

Pass the wires through the gland nut and clamping insert.

Clampinginsert

Gland nut

1. Strip 4-1/2 inch (115 mm) of cable jacket.2. Remove the clear wrap and filler material.3. Strip all but 3/4 inch (19 mm) of shielding.

1. Strip 4-1/4 inch (108 mm) of cable jacket.2. Remove the clear wrap and filler material.3. Strip all but 1/2 inch (12 mm) of shielding.

NPT M20

Wiring


4-wire cable shieldingFigure 3-2:

Assemble the Gland1. Fold the shield or braid back over the clamping insert and 1/8 inch

(3 mm) past the O-ring.2. Install the gland body into the conduit opening on the core processor housing.3. Insert the wires through gland body and tighten the gland nut onto the gland body.

Apply the Heat Shrink1. Slide the shielded heat shrink over the drain wires. Ensure that the

wires are completely covered. 2. Apply heat (250 °F or 120 °C) to shrink the tubing. Do not burn the

cable.3. Position the clamping insert so the interior end is flush with the braid

of the heat shrink.

Cable shield type

Braided(armored cable)

Foil(shielded cable)

Done

Terminate the shield and drain wires in the

gland

Assemble the gland according to vendor

instructions

Gland supplierMicro Motion

cable glandUser-supplied

cable gland

From the preparation procedure

After heat applied

Shield folded back Gland body

Gland type M20

Trim 7 mm from the shielded heat shrink

Shielded heatshrink

Trim

NPT

4-wire cable types and usageMicro Motion offers two types of 4-wire cable: shielded and armored. Both types containshield drain wires.

The 4-wire cable supplied by Micro Motion consists of one pair of red and black 18 AWG(0.75 mm2) wires for the VDC connection, and one pair of white and green 22 AWG(0.35 mm2) wires for the RS-485 connection.

User-supplied 4-wire cable must meet the following requirements:

Wiring


• Twisted pair construction.

• Applicable hazardous area requirements, if the core processor is installed in ahazardous area.

• Wire gauge appropriate for the cable length between the core processor and thetransmitter.

Wire gaugeTable 3-2:

Wire gauge Maximum cable length

VDC 22 AWG (0.35 mm2) 300 ft (90 m)

VDC 20 AWG (0.5 mm2) 500 ft (150 m)

VDC 18 AWG (0.8 mm2) 1000 ft (300 m)

RS-485 22 AWG (0.35 mm2) or larger 1000 ft (300 m)

3.2.2 Connect the wires to the core processor terminalsAfter the 4-wire cable has been prepared and shielded (if required), connect the individualwires of the 4-wire cable to the terminals on the core processor.

Wiring


Core processor terminalsFigure 3-3:

Connect the wires to the transmitter terminals

(see the transmitter manual)

Reinstall and tighten the core processor cover

Core processor type

From Step 1 or 2

Connect the wires to the core processor terminals:Red wire > Terminal 1 (Power supply +)Black wire > Terminal 2 (Power supply –)White wire > Terminal 3 (RS-485/A)Green wire > Terminal 4 (RS-485/B)

Connect the wires to the core processor terminals:Red wire > Terminal 1 (Power supply +)Black wire > Terminal 2 (Power supply –)White wire > Terminal 3 (RS-485/A)Green wire > Terminal 4 (RS-485/B)

Enhanced core processor

Standard core processor

1. Reinstall the core processor cover.2. Torque cover screws to:• 10–13 in-lbs (1,13–1,47 N-m) for aluminum housing• Minimum 19 in-lbs (2,1 N-m) for stainless steel

housing

3.3 Connect 9-wire cable1. Prepare and install the cable according to the instructions in the Micro Motion 9-

Wire Flowmeter Cable Preparation and Installation Guide.

2. Insert the stripped ends of the individual wires into the terminal blocks. Ensure thatno bare wires remain exposed.

Wiring


3. Match the wires color for color. For wiring at the transmitter or remote coreprocessor, refer to the transmitter documentation.

4. Tighten the screws to hold the wires in place.

5. Ensure integrity of gaskets, then tightly close and seal the junction box cover and allhousing covers on the transmitter or core processor.

6. Refer to the transmitter installation manual for signal and power wiring instructions.

Wiring


4 Grounding

The meter must be grounded according to the standards that are applicable at the site.The customer is responsible for knowing and complying with all applicable standards.

Prerequisites

Micro Motion suggests the following guides for grounding practices:

• In Europe, IEC 79-14 is applicable to most installations, in particular Sections12.2.2.3 and 12.2.2.4.

• In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associatedapplications and requirements.

If no external standards are applicable, follow these guidelines to ground the sensor:

• Use copper wire, 14 AWG (2,0 mm2) or larger wire size.

• Keep all ground leads as short as possible, less than 1 Ω impedance.

• Connect ground leads directly to earth, or follow plant standards.

CAUTION!

Ground the flowmeter to earth, or follow ground network requirements for the facility.Improper grounding can cause measurement error.

Procedure

Check the joints in the pipeline.

- If the joints in the pipeline are ground-bonded, the sensor is automatically groundedand no further action is necessary (unless required by local code).

- If the joints in the pipeline are not grounded, connect a ground wire to the groundingscrew located on the sensor electronics.

TipThe sensor electronics may be a transmitter, core processor, or junction box. The groundingscrew may be internal or external.

Grounding


5 Supplementary informationTopics covered in this chapter:

• Purge the sensor case

• About rupture disks

• Pressure ratings for EN-1092 flanges

5.1 Purge the sensor caseIf the sensor has purge fittings, they should remain sealed at all times. After a purge plughas been removed, the sensor case should be purged with argon or nitrogen and resealed.

Purging the case protects internal components. The sensor is purged of all oxygen andsealed at the factory. If the purge plugs are never removed, it is not necessary to purge orre-seal the sensor. For more information, contact Micro Motion Customer Service.

If a purge plug is removed from the sensor case, it will be necessary to repurge the case.

CAUTION!

Take all necessary precautions when removing purge plugs. Removing a purge plugcompromises the secondary containment of the sensor and could expose the user to processfluid.

CAUTION!

Improper pressurization of the sensor case could result in personal injury. Removing a purgeplug will require the sensor case to be repurged with a dry inert gas. Follow all instructionsprovided in the case purging procedure.

Prerequisites

Make sure the following are available before beginning the purge procedure:

• Teflon® tape

• Argon or nitrogen gas sufficient to purge the sensor case

Procedure

1. Shut down the process, or set control devices for manual operation. Beforeperforming the case purging procedure, shut down the process or set the controldevices for manual operation. Performing the purge procedure while the flowmeteris operating could affect measurement accuracy, resulting in inaccurate flow signals.

2. Remove both purge plugs from the sensor case. If purge lines are being used, openthe valve in the purge lines.

3. Prepare the purge plugs for reinstallation by wrapping them with 3–5 turns of Teflontape.

Supplementary information


4. Connect the supply of nitrogen or argon gas to the inlet purge connection or openinlet purge line. Leave the outlet connection open.

• Exercise caution to avoid introducing dirt, moisture, rust, or other contaminantsinto the sensor case.

• If the purge gas is heavier than air (such as argon), locate the inlet lower than theoutlet, so that the purge gas will displace air from bottom to top.

• If the purge gas is lighter than air (such as nitrogen), locate the inlet higher thanthe outlet, so that the purge gas will displace air from top to bottom.

5. Make sure that there is a tight seal between the inlet connection and sensor case, sothat air cannot be drawn by suction into the case or purge line during the purgingprocess.

6. Run purge gas through the sensor.

The purge time is the amount of time required for full exchange of atmosphere toinert gas. The larger the line size, the greater amount of time is required to purgethe case. See Table 5-1. If purge lines are being used, increase the purge time to fillthe additional volume of the purge line.

NoteKeep the purge gas pressure below 30 psig (2 bar).

Purge timeTable 5-1:

Sensor model Purge rate, in ft3/hr (l/h) Time, in minutes

CMF010 20 (566) 1

CMF025 20 (566) 1

CMF050 20 (566) 2

CMF100 20 (566) 5

CMF200 20 (566) 12

CMF300 20 (566) 30

CMF400 20 (566) 55

CMFHC2 20 (566) 100

CMFHC3 20 (566) 170

CMFHC4 20 (566) 268

7. At the appropriate time, shut off the gas supply, then immediately seal the purgeoutlet and inlet connections with the purge plugs.

NoteAvoid pressurizing the sensor case. If pressure inside the case elevates above atmosphericpressure during operation, the flowmeter density calibration will be inaccurate.



8. Make sure that the purge fitting seals are tight so that air cannot be drawn bysuction into the sensor case.

5.2 About rupture disksRupture disks are meant to vent process fluid from the sensor case in the event of a flowtube rupture. Some users connect a pipeline to the rupture disk to help contain escapingprocess fluid. For more information about rupture disks, contact Micro Motion CustomerService.

If the sensor has rupture disks, they are installed in the sensor purge fitting openings. Therupture disks should remain installed at all times. If you remove a rupture disk from thesensor case, it will be necessary to re-purge the case.

CAUTION!

Stay clear of the rupture disk pressure relief area. High-pressure fluid escaping from the sensorcan cause severe injury or death.

5.3 Pressure ratings for EN-1092 flangesSee Figure 5-1 for pressure ratings for EN-1092 flanges.



Pressure ratings for EN-1092 flangesFigure 5-1:

120

100

80

60

40

20

0

ABC

D

0 50 150 200 250 300 350 400 427

°C

bar

A. EN 1092-1 PN40, Form B1; 11 weld neck; 304 stainless steelB. EN 1092-1 PN40, Form B1 & D; 11 weld neck; 316 stainless steelC. EN 1092-1 PN100, Form B2 & D; 11 weld neck; 316 stainless steelD. EN 1092-1 PN40, Form B1; 32/02 lap joint; alloy C-22 collar/304 stainless steel flange



*20002158*20002158

Rev DD

2012

Micro Motion Inc. USAWorldwide Headquarters7070 Winchester CircleBoulder, Colorado 80301T +1 303-527-5200T +1 800-522-6277F +1 303-530-8459www.micromotion.com

Micro Motion EuropeEmerson Process ManagementNeonstraat 16718 WX EdeThe NetherlandsT +31 (0) 318 495 555F +31 (0) 318 495 556www.micromotion.nl

Micro Motion AsiaEmerson Process Management1 Pandan CrescentSingapore 128461Republic of SingaporeT +65 6777-8211F +65 6770-8003

Micro Motion United KingdomEmerson Process Management LimitedHorsfield WayBredbury Industrial EstateStockport SK6 2SU U.K.T +44 0870 240 1978F +44 0800 966 181

Micro Motion JapanEmerson Process Management1-2-5, Higashi ShinagawaShinagawa-kuTokyo 140-0002 JapanT +81 3 5769-6803F +81 3 5769-6844

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